Physics Electromagnetic Induction PMDC 2021
PMDC Verified Question 57 of 69
Which is the correct relation:
A
Ns/Np = Vs/Vp
B
NsNp = Vs/Vp
C
Ns/Np = Is/Ip
D
None
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Ns/Np = Vs/Vp
Concept:

In a transformer, the ratio of voltages is directly proportional to the ratio of turns.

Formula:

$$ \frac{N_s}{N_p} = \frac{V_s}{V_p} $$

Solution:

  • The voltage induced per turn is constant for both coils. Therefore, \( \frac{V_s}{N_s} = \frac{V_p}{N_p} \).


  • Rearranging gives the correct relation: \( \frac{N_s}{N_p} = \frac{V_s}{V_p} \).


Why other options are incorrect:

Option B is mathematically meaningless. Option C is incorrect because current ratio is inversely proportional to the turns ratio (\( \frac{N_s}{N_p} = \frac{I_p}{I_s} \)).

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